These furnaces are generally induction or gas fired furnaces. Here the fume extraction system is generally used for recovery of fumes as they are product for the Melter. In this furnace only primary fume extraction systems are used to collect the zinc powder in the form of zinc and they are collected from the bag filter discharged and packed directly. The outlet emission after these systems can be achieved as low as 2 mg/nm3 depending on the pollution control norms at the location.